G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.03
G01R 31/08 (2006.01) H04M 3/30 (2006.01)
Patent
CA 1210452
-17- BIASED REACTOR MAINTENANCE TERMINATION UNIT Abstract A method and apparatus for locating faults in a transmission line on the customer side or network side of the apparatus as well as on both sides is disclosed. A biased reactor maintenance termination unit is described that comprises a saturable core reactor, a permanent magnet and a termination network. The saturable core reactor is connected in series with conductors of a transmission line. The permanent magnet is placed adjacent to the reactor to create a bias mmf. Finally, the termination network is connected across the transmission line conductors. The maintenance termination unit responds to testing apparatus located at a maintenance center to determine fault location. In response to an ac signal transmitted from the testing apparatus, a series of voltage spikes, are generated by the reactor. The spike signal returns along the transmission line to the testing apparatus which includes oscilloscope and a spectrum analyzer. The positive going spikes will not be equispaced from the negative going spikes but will be displaced due to the bias mmf effect of the permanent magnet. Thereafter, a dc test signal is applied to the conductors to cancel the bias mmf created by the magnet. If the dc test signal value is of appropriate sign and equal to an ibias value of the bias mmf when the null condition occurs, the fault will be after the maintenance termination unit indicating a fault on the customer side. If the dc test signal value is greater than ibias value when the null condition occurs, then there is a fault on both the customer and network sides of maintenance termination unit. If the bias mmf cannot be nulled by the dc test signal, the fault will be before the maintenance termination unit indicating a fault on the network side.
455183
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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